package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());


        //购物车查是否有数据
         List<ShoppingCart> shoppingCartList= shoppingCartMapper.list(shoppingCart);

         //如果当前数据在购物车就加一数量
         if(null!=shoppingCartList&&shoppingCartList.size()==1){
             shoppingCart = shoppingCartList.get(0);
             shoppingCart.setNumber(shoppingCart.getNumber()+1);
             shoppingCartMapper.updateNumberById(shoppingCart);
         }else {
             //如果不存在，插入数据，数量就是1
             Long dishId = shoppingCartDTO.getDishId();
             //判断当前添加到购物车的是菜品还是套餐
             if(dishId!=null){
                 //添加到购物车的是菜品
                 Dish dish = dishMapper.getById(dishId);
                 shoppingCart.setName(dish.getName());
                 shoppingCart.setImage(dish.getImage());
                 shoppingCart.setAmount(dish.getPrice());

             }else {
                 //添加到购物车的是套餐
                 Setmeal setmeal = setmealMapper.selectById(shoppingCartDTO.getSetmealId());
                 shoppingCart.setSetmealId(shoppingCartDTO.getSetmealId());
                 shoppingCart.setName(setmeal.getName());
                 shoppingCart.setImage(setmeal.getImage());
                 shoppingCart.setAmount(setmeal.getPrice());
             }

             shoppingCart.setNumber(1);
             shoppingCart.setCreateTime(LocalDateTime.now());
             shoppingCartMapper.insert(shoppingCart);

         }



    }
    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {

     return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());

    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanAll() { shoppingCartMapper.cleanAll(BaseContext.getCurrentId());
    }
    /**
     * 删除购物车中一个商品的数量
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //如果是0的话删除
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(null!=shoppingCartList&&shoppingCartList.size()==1){
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
            if(shoppingCart.getNumber()==0){
                shoppingCartMapper.delete(shoppingCart.getId());
            }
            shoppingCartMapper.updateNumberById(shoppingCart);
        }

    }
}
